GitopsCentral

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© nickjanetakis.com

Basic commands

docker images # view images
docker ps -a # view containers status
docker pull ubuntu # downloads ubuntu image

docker run -d ubuntu # de-attached mode
docker run -it ubuntu # interactive mode
docker run -d --name myubuntu ubuntu # naming
docker run -it --name myubuntu ubuntu /bin/bash # running docker with bash

docker start myubuntu
docker stop myubuntu

docker rm myubuntu # removes containers
docker rmi ubuntu:latest # removes image ubuntu:[tagname]
docker rm $(docker ps -aq) # removes all containers
docker rmi $(docker images -q)

Docker Swarm

 docker swarm init --listen-addr [your_ip]:2377 --secret SECRET123
 note: engine port-2375;secure engine port-2376;swarm port-2377

docker info # view swarms

Join as manager

docker swarm join --secret SECRET123 \
 --ca-hash sha256:e293898euq48uiu \
 192.168.1.1:2377 \
 --manager \
 --listen-addr 192.168.1.2:2377

Join as worker and automatically accepted

docker swarm join --secret SECRET123 \
 --ca-hash sha256:e293898euq48uiu \
 192.168.1.1:2377 \
 --listen-addr 192.168.1.2:2377

Auto Join Manager-Worker

docker swarm init --listen-addr [your_ip]:2377 --secret SECRET123 --auto-accept worker

docker swarm init --listen-addr [your_ip]:2377 --secret SECRET123 --auto-accept manager

docker swarm init --listen-addr [your_ip]:2377 --secret SECRET123 --auto-accept worker,manager

Note: Manager needs acceptance/approval to join, worker doesn’t need

List swarm and its status

docker node ls

Accept Node

docker node accept 7ywq67qwyf68qr6ryuy

Promote worker to manager

docker node promote 9u35d53gd6yfsd36dghdgd # the ID you get when you do, node ls